Argumentum

Added

• It is now possible to add an instantiated instance of CommandOptions with add_command. This
  makes it easier to access global options from within command options. See the test
  shouldAccessParentOptionsFromCommand in command_t.cpp and the new example in the README file.
• The help formatter can be changed in parser configuration. See the test shouldChangeHelpFormatter
  in parserconfig_t.cpp.

Changed

• The interface for defining program parameters has changed. The parameters are defined through the
  params() method of the argument_parser class. The old argument_parser methods for defining
  parameters are deprecated and will be removed.
• Fix: Treat negative numbers as numbers when they can not be mistaken for options.